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Alpha, IL
Full City Profile · Illinois · Henry County County
3.7
/5.0
B+
Good
801
Population
2,584/sq mi density
$75,139
Median Income
$39,524 per capita
$115,700
Home Value
$151,445 Zillow
$957
Median Rent
25.0% income on rent
49°F
Avg Temperature
275 sunny days/yr
B+
Overall
3.7 / 5.0
Good overall score based on economy, affordability, safety and education
A+
Economy
4.5 / 5.0
$75,139 median income, 1.6% unemployment
A+
Affordability
5.0 / 5.0
$115,700 home value, $957/mo rent
C+
Safety
2.5 / 5.0
0 violent crimes/100K
C+
Education
2.7 / 5.0
20.7% bachelor's degree or higher
Alpha experiences four distinct seasons with an average annual temperature of 49°F (9°C). Winters average 21°F in January while summers reach 73°F in July. The area gets 275 sunny days per year. Annual precipitation totals 39.4 inches. Air quality is rated Good with a median AQI of 43.
Temperature
21°F Jan (-6°C)
73°F Jul (23°C)
| Annual Average | 49.0°F |
| 9% below US avg | |
| January Average | 21°F (-6°C) |
| July Average | 73°F (23°C) |
| Sunny Days | 275 days/yr |
Geography
| Elevation | 803 ft (245 m) |
| Area | 0.1 sq mi (0.3 km²) |
| Population Density | 2,584/sq mi |
| Coordinates | 41.1917°N, 90.3805°W |
| Timezone | America/Chicago |
| County | Henry County County |
| Nearest Airport | Quad Cities International (MLI) 19 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 43.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively Low |
| Risk Score | 57.1 / 100 |
| Social Vulnerability | 14.8 / 100 |
| Community Resilience | 83.8 / 100 |
Hazard Breakdown
| Tornado | Relatively Moderate |
| Hurricane | Very Low |
| Earthquake | Very Low |
| Wildfire | Very Low |
| Flood | Relatively Low |
| Hail | Relatively Moderate |
| Strong Wind | Relatively High |
| Heat Wave | Relatively Low |
| Winter Weather | Relatively Moderate |
| Lightning | Relatively Moderate |
| Ice Storm | Relatively Moderate |
| Drought | Relatively High |
| Cold Wave | Relatively Low |
| Landslide | Relatively Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 21°F (-6°C) | 1.5 in | Coldest |
| February | 26°F (-3°C) | 1.3 in | Driest |
| March | 38°F (3°C) | 2.8 in | |
| April | 50°F (10°C) | 3.8 in | |
| May | 61°F (16°C) | 4.1 in | |
| June | 71°F (22°C) | 4.3 in | |
| July | 73°F (23°C) | 4.5 in | Warmest, Wettest |
| August | 72°F (22°C) | 4.1 in | |
| September | 64°F (18°C) | 3.8 in | |
| October | 53°F (11°C) | 2.9 in | |
| November | 39°F (4°C) | 2.6 in | |
| December | 26°F (-3°C) | 2.1 in |
Alpha has a seasonal temperature swing of 51°F / from 21°F in January to 73°F in July. Total annual precipitation is 37.7 inches, with July being the wettest month (4.5") and February the driest (1.3").